Is there a possibility that the 12 tooth metal gear will become high strength with a 1/4 inch shaft? It’s needed, as currently, you have to attach it with a 1/8 inch axle.
High strength 12 tooth gear
Ours have the 1/4" hole with a metal insert for regular shafts. Maybe you have an older set of gears?
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The newer ones have high strength holes.